Fluid injecting apparatus

Abstract

A fluid injecting apparatus includes: a cartridge portion which has a tube that transports a fluid, a plurality of fingers that press the tube, and a blocking member that blocks the tube; and a main body portion which has a cam that presses the plurality of fingers. When the cartridge portion is detached from the main body portion, the blocking member blocks the tube. When the cartridge portion is mounted to the main body portion, the cam presses at least one of the fingers such that the tube is blocked at the position of the pressed finger and the blocking of the tube by the blocking member is released.

What is claimed is: 
     
       1. A fluid injecting apparatus comprising:
 a cartridge portion which has a tube that transports a fluid and a blocking member that blocks the tube; and 
 a main body portion which is attachable to and detachable from the cartridge portion, 
 wherein the blocking member presses the tube to block the tube when the cartridge portion is detached from the main body portion and the blocking of the tube by the blocking member is automatically released when the cartridge portion is mounted to the main body portion. 
 
     
     
       2. The fluid injecting apparatus according to  claim 1 ,
 wherein the cartridge portion has a plurality of fingers which abut on the tube, 
 the main body portion has a cam that displaces the plurality of fingers, and 
 when the cartridge portion is mounted to the main body portion, the tube is blocked as the cam abuts on at least one of the fingers. 
 
     
     
       3. The fluid injecting apparatus according to  claim 2 ,
 wherein the main body portion includes an engagement member, 
 the cartridge portion includes an impelling member that impels the blocking member toward the tube, and 
 when the cartridge portion is mounted to the main body portion, the engagement member is engaged so that the blocking member is in a state of not blocking the tube. 
 
     
     
       4. The fluid injecting apparatus according to  claim 3 ,
 wherein, when the cartridge portion is detached from the main body portion, the engagement is released, and the blocking member blocks the tube by the impelling force of the impelling member. 
 
     
     
       5. The fluid injecting apparatus according to  claim 1 , further comprising:
 a guide member which guides a movement of the blocking member in a direction toward the tube. 
 
     
     
       6. The fluid injecting apparatus according to  claim 1 ,
 wherein the tube is made of an elastic material that is deformable. 
 
     
     
       7. The fluid injecting apparatus according to  claim 1 ,
 wherein the blocking member is provided on a downstream side of the fingers in a transport direction of the fluid. 
 
     
     
       8. The fluid injecting apparatus according to  claim 1 , further comprising:
 a needle member provided on a downstream side of the blocking member in the transport direction of the fluid; and 
 a storage portion which stores the fluid on an upstream side of the fingers. 
 
     
     
       9. The fluid injecting apparatus according to  claim 1 ,
 wherein the main body portion includes a pressure sensor that detects a pressure of the tube, and 
 the detachment of the cartridge portion from the main body portion is detected on the basis of the detection of the pressure sensor. 
 
     
     
       10. The fluid injecting apparatus according to  claim 1 ,
 wherein the cartridge portion includes an impelling member that impels the blocking member toward the tube; and 
 the blocking member is moved toward the tube by the impelling member and presses the tube to block the tube when the cartridge portion is detached from the main body portion, and the blocking of the tube by the blocking member is automatically released when the cartridge portion is mounted to the main body portion. 
 
     
     
       11. The fluid injecting apparatus according to  claim 1 ,
 wherein the main body portion has a protrusion, and 
 the blocking member is disposed in a blocking position such that the blocking member presses the tube to block the tube when the cartridge portion is detached from the main body portion, and the protrusion moves the blocking member to a block releasing position such that the blocking of the tube by the blocking member is automatically released when the cartridge portion is mounted to the main body portion.